Mastering Adding and Subtracting Decimals

The video tutorial covers the basics of adding and subtracting decimals. It introduces key vocabulary such as 'sum' and 'difference' and emphasizes the importance of lining up decimal points. The tutorial provides step-by-step instructions for both addition and subtraction, highlighting common mistakes like forgetting to align decimals or add zeros for place value. Several examples are worked through to reinforce the concepts, and students are encouraged to practice on their own.

What is the term used for the result of an addition problem?

• Product

• Quotient

• Sum

• Difference

Tags

CCSS.5.OA.A.1

CCSS.5.OA.A.2

What is the most common mistake when adding decimals?

• Ignoring the decimal point

• Not lining up the decimals

• Forgetting to add zeros

• Adding instead of subtracting

Tags

CCSS.5.NBT.B.7

What should you do immediately after writing a decimal addition problem?

• Check for mistakes

• Start adding from the left

• Bring the decimal point straight down

• Add zeros for place value

Tags

CCSS.5.NBT.B.7

When subtracting decimals and you can't subtract a larger number from a smaller one, what should you do?

• Borrow from the next column

• Ignore the decimal point

• Round the numbers

• Start over

Tags

CCSS.5.NBT.B.7

How do you change whole numbers into decimals for the purpose of aligning decimals?

• Add a decimal point and zeros after it

• Multiply by 100

• Divide by 100

• Subtract 1 from the whole number

Tags

CCSS.5.NBT.B.7

What is the result of 1.25 + 1.35?

• 2.60

• 2.70

• 2.50

• 2.80

Tags

CCSS.6.NS.B.3

What is the result of 2 - 1.26?

• 0.94

• 0.64

• 0.84

• 0.74

Tags

CCSS.5.NBT.B.7

What is the result of 2.14 + 0.92?

• 3.16

• 2.06

• 3.26

• 3.06

Tags

CCSS.6.NS.B.3

What is the result of 3.72 - 1.5?

• 2.12

• 2.22

• 2.32

• 2.42

Tags

CCSS.5.NBT.B.7

Why is it important to bring the decimal point straight down in your answer?

• To make the problem look neat

• To avoid borrowing from other numbers

• Because it's easier to subtract

• To ensure correct place value

Tags

CCSS.5.NBT.B.7